The 5500 basic design of Antimicrobial Dillon Back & Seat Managers Chair is an excellent example of simplicity at its best. AirGrid Back with built-in lumbar support conforms to your back for passive ergonomic support. Seat is thickly cushioned for enhanced comfort. Both seat & back are upholstered in antimicrobial vinyl for easier cleaning & longer-lasting use. Functions of this professional chair include One Touch pneumatic seat-height adjustment, 360-degree swivel & 2-to-1 synchro tilt control with adjustable tilt tension. Angled arms with soft pads are height-adjustable. Heavy-duty, angled nylon base has oversized, dual-wheel carpet casters.